[Feature] Split-trajectories and represent as nested tensor #10504

Job	Run time
build-wheel-linux (3.8, cp38-cp38, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 30s
build-wheel-windows (3.8, 3.8)	1m 58s
build-wheel-linux (3.9, cp39-cp39, --index-url https://download.pytorch.org/whl/cpu, "['cpu', '11...	1m 34s
build-wheel-windows (3.9, 3.9)	2m 36s
build-wheel-linux (3.10, cp310-cp310, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 30s
build-wheel-windows (3.10, 3.10.3)	3m 31s
build-wheel-linux (3.11, cp311-cp311, --index-url https://download.pytorch.org/whl/cpu, "['cpu', ...	1m 31s
build-wheel-windows (3.11, 3.11)	3m 5s
test-wheel (linux, ubuntu-20.04, 3.8)	2m 12s
test-wheel (linux, ubuntu-20.04, 3.9)	3m 0s
test-wheel (linux, ubuntu-20.04, 3.10)	2m 34s
test-wheel (linux, ubuntu-20.04, 3.11)	2m 18s
test-wheel-windows (3.8)	6m 46s
test-wheel-windows (3.9)	5m 14s
test-wheel-windows (3.10)	4m 37s
test-wheel-windows (3.11)	4m 23s
	48m 19s

Provide feedback